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Cheap flights from Ontario (ONT) to Illinois from $63

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/31. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ONT — ORD
May 21 — May 281
From?
To?
Tue 5/21
Tue 5/28
1 adult, Economy
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How far in advance should I book a flight from Ontario to Illinois?

To save up to 73% on this flight, we recommend booking at least 31 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Ontario to Illinois from $319 1-2 weeks out and tickets from $510 for flights departing within the next 72 hours.

What is the cheapest month to fly from Ontario to Illinois?

Our data shows that January tends to be the cheapest month to fly to Illinois from Ontario. Users have commonly found prices around $314 for the month, but tickets can be as low as $135. Due to multiple factors, prepare for potentially higher prices in March.

When is the cheapest time to fly from Ontario to Illinois (ONT - IL)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Illinois as you normally would.

Cheap Frontier flights from Ontario to Illinois

Explore cheap flight options specifically provided by Frontier for the route between Ontario and Illinois. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Check out some of the cheapest Frontier flights we've come across from Ontario to Illinois. Come back soon if you're not finding the exact deal you're looking for.
Fri 5/316:01 pmONT - STL
1 stop14h 12mFrontier
Mon 6/38:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/15$127
Mon 8/195:30 pmONT - MDW
1 stop11h 03mFrontier
Tue 8/2711:32 amMDW - ONT
1 stop7h 18mFrontier
Deal found 5/16$136
Tue 8/2712:49 amONT - ORD
1 stop22h 14mFrontier
Tue 9/38:00 amORD - ONT
1 stop17h 39mFrontier
Deal found 5/14$137
Tue 8/2012:00 pmONT - ORD
1 stop14h 47mFrontier
Sat 8/247:30 pmORD - ONT
1 stop13h 38mFrontier
Deal found 5/16$138
Tue 5/2812:59 amONT - ORD
1 stop22h 14mFrontier
Wed 6/58:23 pmORD - ONT
1 stop12h 40mFrontier
Deal found 5/15$139
Tue 8/2012:00 pmONT - ORD
1 stop14h 47mFrontier
Sun 8/257:30 pmORD - ONT
1 stop15h 36mFrontier
Deal found 5/16$140
Fri 5/3112:59 amONT - ORD
1 stop21h 19mFrontier
Tue 6/47:59 pmORD - ONT
1 stop23h 49mFrontier
Deal found 5/15$141
Tue 8/205:30 pmONT - ORD
1 stop9h 17mFrontier
Thu 8/227:30 pmORD - ONT
1 stop15h 36mFrontier
Deal found 5/14$142
Mon 8/198:35 pmONT - ORD
1 stop6h 12mFrontier
Sat 8/245:56 pmORD - ONT
1 stop7h 48mFrontier
Deal found 5/16$143

Cheap Delta flights from Ontario to Illinois

Explore cheap flight options specifically provided by Delta for the route between Ontario and Illinois. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Take a gander at the lowest prices we've found on Delta flights from Ontario to Illinois. Deals are refreshing constantly so come back soon for more options.
Sat 6/87:05 amONT - MLI
1 stop7h 50mDelta
Fri 6/145:35 pmMLI - ONT
1 stop7h 25mDelta
Deal found 5/15$276
Fri 5/311:20 pmONT - ORD
1 stop6h 12mDelta
Sat 6/81:25 pmORD - ONT
2 stops11h 35mDelta
Deal found 5/15$284
Fri 5/3110:00 pmONT - ORD
2 stops8h 59mDelta
Sat 6/81:25 pmORD - ONT
2 stops11h 35mDelta
Deal found 5/15$289
Wed 5/226:50 amONT - ORD
1 stop10h 51mDelta
Wed 5/2911:45 amORD - ONT
2 stops10h 21mDelta
Deal found 5/15$295
Sat 6/87:05 amONT - MLI
1 stop7h 50mDelta
Tue 6/115:35 pmMLI - ONT
1 stop7h 25mDelta
Deal found 5/15$307
Thu 5/231:20 pmONT - ORD
1 stop6h 12mDelta
Sun 5/265:15 pmORD - ONT
1 stop6h 24mDelta
Deal found 5/16$322
Thu 5/231:20 pmONT - ORD
1 stop6h 12mDelta
Sun 5/266:07 amORD - ONT
2 stops8h 06mDelta
Deal found 5/16$327
Sat 8/311:20 amONT - BMI
1 stop9h 23mDelta
Tue 8/134:00 pmBMI - ONT
1 stop8h 12mDelta
Deal found 5/15$386
Tue 5/212:13 pmONT - ORD
1 stop7h 52mDelta
Mon 5/276:07 amORD - ONT
2 stops8h 06mDelta
Deal found 5/14$405

Cheap Ontario to Illinois flights in May & June 2024

Find cheap flight options from Ontario to Illinois specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Prices were last updated on May 16, 2024.
The lowest fares we've come across on flights traveling from Ontario to Illinois in May and June 2024. Check back regularly for other flight deals.
Fri 5/316:01 pmONT - STL
1 stop14h 12mFrontier
Mon 6/38:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/15$127
Tue 5/2112:59 amONT - STL
1 stop6h 37mFrontier
Tue 5/282:12 pmSTL - ONT
1 stop27h 53mFrontier
Deal found 5/14$137
Sun 5/1911:30 pmONT - STL
1 stop8h 43mFrontier
Thu 5/3011:06 pmSTL - ONT
1 stop26h 53mFrontier
Deal found 5/16$139
Tue 6/412:59 amONT - MDW
1 stop9h 01mFrontier
Wed 6/128:58 pmMDW - ONT
1 stop12h 05mFrontier
Deal found 5/16$139
Tue 5/2812:59 amONT - ORD
1 stop22h 14mFrontier
Wed 6/58:23 pmORD - ONT
1 stop12h 40mFrontier
Deal found 5/15$139
Sat 6/110:10 pmONT - STL
1 stop10h 03mFrontier
Thu 6/63:32 pmSTL - ONT
1 stop10h 12mFrontier
Deal found 5/16$140
Sat 6/82:29 pmONT - MDW
1 stop12h 52mFrontier
Tue 6/118:02 pmMDW - ONT
1 stop23h 46mFrontier
Deal found 5/15$140
Sat 5/255:41 pmONT - ORD
1 stop9h 19mFrontier
Wed 5/296:45 pmORD - ONT
1 stop7h 14mFrontier
Deal found 5/16$140
Wed 5/1511:09 pmONT - STL
1 stop9h 04mFrontier
Wed 5/2210:21 pmSTL - ONT
1 stop12h 19mFrontier
Deal found 5/15$141

Ontario to Illinois 2024 flight deals

Discover exclusive flight deals for travel between Ontario and Illinois in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
The lowest fares we've come across on flights traveling from Ontario to Illinois in May and June 2024. Check back regularly for other flight deals.
Fri 5/316:01 pmONT - STL
1 stop14h 12mFrontier
Mon 6/38:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/15$127
Mon 8/195:30 pmONT - MDW
1 stop11h 03mFrontier
Tue 8/2711:32 amMDW - ONT
1 stop7h 18mFrontier
Deal found 5/16$136
Tue 5/2112:59 amONT - STL
1 stop6h 37mFrontier
Tue 5/282:12 pmSTL - ONT
1 stop27h 53mFrontier
Deal found 5/14$137
Mon 8/1912:51 pmONT - MDW
1 stop15h 42mFrontier
Sat 8/2410:00 pmMDW - ONT
1 stop11h 08mFrontier
Deal found 5/16$137
Tue 8/2712:49 amONT - ORD
1 stop22h 14mFrontier
Tue 9/38:00 amORD - ONT
1 stop17h 39mFrontier
Deal found 5/14$137
Fri 9/612:49 amONT - MDW
1 stop9h 03mFrontier
Wed 9/1110:00 pmMDW - ONT
1 stop11h 08mFrontier
Deal found 5/15$138
Tue 8/2012:00 pmONT - ORD
1 stop14h 47mFrontier
Sat 8/247:30 pmORD - ONT
1 stop13h 38mFrontier
Deal found 5/16$138
Sun 5/1911:30 pmONT - STL
1 stop8h 43mFrontier
Thu 5/3011:06 pmSTL - ONT
1 stop26h 53mFrontier
Deal found 5/16$139
Tue 6/412:59 amONT - MDW
1 stop9h 01mFrontier
Wed 6/128:58 pmMDW - ONT
1 stop12h 05mFrontier
Deal found 5/16$139

Ontario to Illinois flights leaving soon

Find last-minute flight options from Ontario to Illinois for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Users seeking a last-minute flight from Ontario to Illinois should consider booking one of these fares. It's wise to confirm all flight details are correct before booking.
Tue 5/2112:59 amONT - STL
1 stop6h 37mFrontier
Tue 5/282:12 pmSTL - ONT
1 stop27h 53mFrontier
Deal found 5/14$137
Tue 5/218:29 pmONT - STL
1 stop11h 44mFrontier
Tue 6/113:47 pmSTL - ONT
1 stop10h 12mFrontier
Deal found 5/16$139
Tue 5/2112:59 amONT - ORD
1 stop22h 14mFrontier
Wed 5/296:45 pmORD - ONT
1 stop7h 14mFrontier
Deal found 5/15$139
Fri 5/2412:59 amONT - MDW
1 stop8h 14mFrontier
Wed 5/299:10 pmMDW - ONT
1 stop12h 14mFrontier
Deal found 5/16$140
Sat 5/255:41 pmONT - ORD
1 stop9h 19mFrontier
Wed 5/296:45 pmORD - ONT
1 stop7h 14mFrontier
Deal found 5/16$140
Fri 5/2412:59 amONT - ORD
1 stop21h 19mFrontier
Wed 5/297:59 pmORD - ONT
1 stop15h 35mFrontier
Deal found 5/16$141
Sat 5/2510:10 pmONT - MDW
1 stop5h 40mFrontier
Tue 5/289:10 pmMDW - ONT
1 stop13h 54mFrontier
Deal found 5/16$142
Sat 5/255:41 pmONT - ORD
1 stop9h 19mFrontier
Tue 5/287:59 pmORD - ONT
1 stop15h 05mFrontier
Deal found 5/15$142
Fri 5/2412:59 amONT - ORD
1 stop21h 19mFrontier
Tue 5/287:59 pmORD - ONT
1 stop18h 56mFrontier
Deal found 5/15$143

One-way flights to Illinois from Ontario

Search for one-way flight options from Ontario to Illinois. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Take a look at some of the one-way flights we've detected from Ontario to Illinois. For those needing a return trip from Ontario, there is a search form available above.
Fri 5/3112:59 amONT - MDW
1 stop18h 07mFrontier
Deal found 5/15$63
Tue 5/2112:59 amONT - ORD
1 stop22h 14mFrontier
Deal found 5/15$63
Tue 8/1312:49 amONT - MDW
1 stop9h 03mFrontier
Deal found 5/16$65
Tue 6/45:41 pmONT - MDW
1 stop8h 59mFrontier
Deal found 5/15$67
Mon 6/39:57 pmONT - MDW
1 stop28h 43mFrontier
Deal found 5/15$68
Tue 6/412:59 amONT - STL
1 stop6h 30mFrontier
Deal found 5/15$70
Sat 6/110:10 pmONT - MDW
1 stop5h 40mFrontier
Deal found 5/15$70
Wed 8/288:35 pmONT - ORD
1 stop6h 12mFrontier
Deal found 5/15$70
Wed 6/58:55 pmONT - MDW
1 stop6h 34mFrontier
Deal found 5/16$71

Find flights from Ontario to Illinois within your budget

Customize your flight search to find flights from Ontario to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$127 - $391

Route

Depart

Return

Price

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Fri 5/31

1 stop14h 12m

Lambert-St Louis

Mon 6/3

1 stop5h 55m

$127

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Mon 8/19

1 stop11h 03m

Chicago Midway

Tue 8/27

1 stop7h 18m

$136

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Tue 5/21

1 stop6h 37m

Lambert-St Louis

Tue 5/28

1 stop27h 53m

$137

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Mon 8/19

1 stop15h 42m

Chicago Midway

Sat 8/24

1 stop11h 08m

$137

OntarioChicago O'Hare Intl

ONT - ORD

ONTORD

Ontario

Tue 8/27

1 stop22h 14m

Chicago O'Hare Intl

Tue 9/3

1 stop17h 39m

$137

OntarioChicago Midway

ONT - MDW

ONTMDW

Ontario

Fri 9/6

1 stop9h 03m

Chicago Midway

Wed 9/11

1 stop11h 08m

$138

OntarioMoline Quad-City

ONT - MLI

ONTMLI

Ontario

Sat 6/8

1 stop7h 50m

Moline Quad-City

Fri 6/14

1 stop7h 25m

$276

OntarioGreater Peoria

ONT - PIA

ONTPIA

Ontario

Wed 9/4

2 stops13h 32m

Greater Peoria

Sat 9/7

2 stops12h 36m

$388

OntarioBloomington-Normal

ONT - BMI

ONTBMI

Ontario

Sat 8/3

2 stops8h 25m

Bloomington-Normal

Tue 8/13

2 stops14h 24m

$391

Flights are sorted by cheapest first

Deals found on 5/15

No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated May 16, 2024.
Get a feel of what it's like to fly with Frontier, Delta and American Airlines from Ontario to Illinois by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.2
Very good
6,040 reviews
Check prices

Entertainment

7.8

Boarding

8.3

Food

7.3

Crew

8.7

Comfort

8.1

Overall

8.2

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Southwest
8.2
Very good
6,040 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Entertainment

7.8

Boarding

8.3

Food

7.3

Crew

8.7

Comfort

8.1

Overall

8.2

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Alaska Airlines
8.1
Very good
9,157 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Entertainment

7.8

Boarding

8.3

Food

7.3

Crew

8.7

Comfort

8.1

Overall

8.2

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Delta
8.0
Very good
10,673 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Entertainment

7.8

Boarding

8.3

Food

7.3

Crew

8.7

Comfort

8.1

Overall

8.2

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

United Airlines
7.4
Good
10,924 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Entertainment

7.8

Boarding

8.3

Food

7.3

Crew

8.7

Comfort

8.1

Overall

8.2

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

American Airlines
7.3
Good
14,514 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Entertainment

7.8

Boarding

8.3

Food

7.3

Crew

8.7

Comfort

8.1

Overall

8.2

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Related info for your journey

Find useful and relevant information for your journey from Ontario to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Illinois?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly out of when you book flights from Ontario to Illinois.

  • Can I find flights from Ontario to Illinois for under $200 on Cheapflights?

    Yes, there are multiple flights from Ontario to Illinois for under $200. The cheapest flight booked recently is on Frontier for just $127, but on average you can expect to pay $138.

  • Are there last-minute flights available from Ontario to Illinois for under $200?

    There are currently 20+ open flights from Ontario to Illinois within the next 7 days for less than $200.

  • What are the most popular routes from Ontario to Illinois?

    The most popular flight routes from Ontario to Illinois are Ontario - Chicago O'Hare Intl, Ontario - Chicago Midway and Ontario - Lambert-St Louis.

  • What are the most popular airlines that fly from Ontario to Illinois?

    Consider American Airlines, Delta or Frontier when booking your flight. These represent the most popular airlines when flying from Ontario to Illinois.

  • What does ONT to ORD mean?

    ONT and ORD are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. ONT to ORD refers to a flight route from Ontario Airport to Chicago O'Hare Intl Airport. Chicago Midway Airport (MDW), Moline Quad-City Airport (MLI), Greater Peoria Airport (PIA), Bloomington-Normal Airport (BMI), Springfield Capital Airport (SPI) are other airports near this flight route and their unique identifiers/IATA codes.

  • Can I find deals for flights from Ontario to Illinois that include extra baggage allowance?

    The amount of baggage you can bring on your Ontario to Illinois flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Ontario to Illinois with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ontario to Illinois flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Ontario to Illinois that include hotel bookings?

    Yes. In addition to deals on Ontario to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Illinois.

  • Can I find deals for business class flights from Ontario to Illinois?

    Yes. Cheapflights offers flight deals from Ontario to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Ontario to Illinois that allow pets onboard?

    Many airlines flying from Ontario to Illinois offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Ontario to Illinois?

    Yes, you can often find last-minute deals on Ontario to Illinois flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Ontario to Illinois flight deals updated?

    The Ontario to Illinois flight deals you see on this page were last updated on 5/16.

See more FAQs

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Alternative routes for Ontario to Illinois
See prices for flight routes from nearby airports that may be better suited for you.

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Top 5 airlines flying from Ontario to Illinois

Discover the top 5 airlines that operate flights from Ontario to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$105Average$261FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
FrontierCheapest$123Average$230FlexibilityNo cancel feeOn-time62%
Search Frontier flights
United AirlinesCheapest$245Average$522FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapest$276Average$411FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$297Average$622FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Boston to Cancún flights
Dallas to San Antonio flights
Reno to Las Vegas flights
Houston to Boston flights
San Francisco to Las Vegas flights
Newark Airport to Fort Lauderdale flights
Los Angeles to Dubai flights
USA to Hyderabad flights
Boston to Phoenix flights
Phoenix to Las Vegas flights
Houston to Paris flights
Ontario to Indiana flights

Search flights from Ontario to Illinois by cabin class

Find flights from Ontario to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Hourly flight availability from Ontario to Illinois

Find hourly flight availability from Ontario to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 16, 2024.
1%of flight departuresEarly morningMidnight to 6 am
83%of flight departuresMorning6 am to noon
16%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ontario to Illinois?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario to Illinois. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Ontario to Illinois?

Millions of users choose and trust Cheapflights to book the best flight deals from Ontario to Illinois for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Ontario to Illinois with no change fees?

Yes! Cheapflights helps users easily find flights from Ontario to Illinois with no change fees.

Can Cheapflights notify me if prices for flights from Ontario to Illinois become cheaper?

Not ready to book yet? You can track prices for flights from Ontario to Illinois on Cheapflights with our Price Alert feature and get notified when better prices are available.

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